package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if (list != null && list.size() > 0) {
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        } else {
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());


            } else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

        /**
         * 查看购物车
         * @return
         */
        @Override
        public List<ShoppingCart> showShoppingCart() {
            //获取当前微信用户id
            Long userId = BaseContext.getCurrentId();
            ShoppingCart shoppingCart = ShoppingCart.builder()
                    .userId(userId)
                    .build();
            List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
            return list;
        }

        /**
         * 清空购物车
         */
        @Override
        public void cleanShoppingCart() {
            //获取当前微信用户id
            Long userId = BaseContext.getCurrentId();
            shoppingCartMapper.deleteByUserId(userId);
        }

        /**
         * 删除购物车的一项数据
         * @param shoppingCartDTO
         */
        @Override
        public void delete(ShoppingCartDTO shoppingCartDTO) {
            ShoppingCart shoppingCart = new ShoppingCart();
            BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
            //设置查询条件，查询当前登录用户的购物车数据
            shoppingCart.setUserId(BaseContext.getCurrentId());

            List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

            if(list != null && list.size() > 0){
                shoppingCart = list.get(0);

                Integer number = shoppingCart.getNumber();
                if(number == 1){
                    //当前商品在购物车中的份数为1，直接删除当前记录
                    shoppingCartMapper.deleteById(shoppingCart.getId());
                }else {
                    //当前商品在购物车中的份数不为1，修改份数即可
                    shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                    shoppingCartMapper.updateNumberById(shoppingCart);
                }
            }
        }
}
